Water-tube boiler



Aug. 16 1927.

K. ENDO WATERTUBE BOILER Filed July 25, 1919 '3 Sheets-Sheet l IN V/f/VTOR 7% M w K. ENDO WATER TUBE BOILER Filed July 23, 1919 s Sheets-Sheet 3 LVIIENTOA WOW/V15 Patented Aug. 16, 1927.

KOTARO ENDO, F TOKYO, JAPAN.

WATER-TUBE BOILER.

Application filed July 23,

This invention relates to improvements in water tube boilers, in which small heating tubes are attached with connection pipes, instead of directly connecting said tubes with a steam and water drum, and one end of each connection pipe is suitably suspended, so as to enable it to expand orcontract freely, one object of the invention being to effect improvements whereby the expansion of small heating tubes is independent of that of the steam and Water drum, while the heating surface is increased and perfect safety of the boiler can be secured. l/Vith the above and other objects in view, the invention consists in the combination and arrangement of parts and in the details of construction hereinafter described. and claimed.

In the accompanying drawings, a referred embodiment of my invention is il ustrated, in which:

Figure 1 is an elevation partly in section.

Figure 2 is a sectional view of the same on a plane at right angles to Figure 1.

' Figure 3 is a perspective view of the same with parts broken away and indicated in section. y

In all figures, the same symbol represents a similar part.

It is publicly known thatvanious improved contrivances relating to several types of water tube boilers have been attempted, and the present invention relates to an im rovement in the water tube boiler of arrow type. The" present invention is characterized in that two steam and water drums, the interior of each of which is dividedinto a steam chamber and a steam. and water chamber and placed on the upper portion of the boiler at its front and rear ends while two water drums, the interior of each of which is divided into awater chamber and a feed collector are arranged at opposite-sides of the boiler at the bottom. Instead of directly connecting thesedrums, small heating tubes are fitted with connection pipes whic communicate with the rearsteam and water drum and are arranged in the samedirection as the water drums, each connection pipe being inclined so that its front end is slightly lowered. The connection pi'pes above stated have a communication with heating tubes, and the tube rows in both outer sides open into the feed collectors provided in the water drums. The water drums are connectedwith steam generating drums located at the cen- 1919. Serial No. 312,849.

tral part of the combustion chamber through circulating pipes, while the'rear steam and water drum has communication with the steam generating drums through steam ascending pipes, the front steam and water drum being connected with the steam drums through pipes 22. The steam and water drums are connected with the heating tubes through the connection pipes, and as the connection pipes are enabled to expand or contract freely, the expansion of the heating tubes is independent of that of the steam and water drums, while at the same time the heating surface is increased and flame is caused to uniformly pass through all parts of the boiler, and the safety of'the boiler is secured.

Referring to the drawings, the interior part of steam and water drum 1 provided at the top of the boiler at its front end is, by means of a partition 2, divided into a steam chamber 3 and a steam and water chamber 4. A separator 5 is arranged in the chamber '4. The partition 2 should preferably beextended the entire length of steam and water drum -1, though it may be made otherwise, and the separator 5 should also be extended' the entire lengthof said drum.

. The separator may be of any suitable form to separate water from steam. The interior part of steam and water drum 6 arranged at the top' of the boiler in its-rear end is, by means of a partition 2', divided also into a steam chamber 3 and a steam and water chamber 4. Thegsteam and water chambers.

4,4 are connected with each other through a group of water tubes 7, while the steam chambers 3, 3 have communication with each other. through a group of heating tubes 8, 9. The heating tubes 8 should be open adjacent to the bottle of separator 5 provided in the front steal and, water drum 1. Each interior parto water drums 10, 10' .is, by means of a conduit 11, divided into a feed collector 12 and awater chamber 13, and the conduit 11 isextended over the entire length'of said waterdrum. The feed collector is, by means of a wall 14, divided into two compartments, which wall is fixed inthe middle part of said drum, as shown. A feed valve is fitted with'the front-part of the feed collector 12 to supply feed water thereto. The feed collectors in both water drums have a communication with each other through a pipe 28.

A header 15 is arranged below the steam and water drums and near each end of the rear steam and water drum 6, and extends in the same direction as the water drum. The rear end of each header 15 is kept in contact with the lower side of said steam and water drum 6. Headers 15' are arranged between the headers 15, and are connected with the rear steam and water drum 6. All of headers 15, 15 are so inclined that their front ends are slightly lowered, and said front ends are suspended by means of suspension rods 15, so that the expansion of such connection pipes when they are subjected to heat, is independent of that of the steam and water drums. The headers 15 are connected with the feed collectors of water drums 10, 10' through a group of water tubes 17, while the headers 15' have their communication with the water chambers of said water'drums through small heating tubes 18. Such small heating tubes are curved as shown, those which are connected with the Water drum 10 being curved reversely to those connected with the water drum 10, and said tubes converging upwardly, a triangular combustion chamber being formed by these small heating tubes and a fire grate. In practice the small heating tubes 18 aforesaid are slightly larger than the tubes 17.

The combustion chamber as described above is provided with steam generating drums 20 in its central part, which drums extend in the same direction as the water drums. The front ends of steam generating drums 20 are'slightl lowered and suspended in the combustion c amber by means of suspension rods 16 as in the case of the connection pipes. Said drums 20 are connected with the water drums through circulating pipes 21 and are also connected with the rear steam and water drum 6 through steam pipes 22. An inner pipe 23 is arranged inside of each steam generating drum, and is connected at one end with a circulating pipe 21. Thereby feed water is introduced to the steam generating drum. Pipes 27 connect the steam chamber 4 of front steam and water drum 1 with the water chambers of Water drum 10, 10. 24 is anouter combustion chamber, and 19 is an upper combustion chamber. of fuel touches the two steam generating drums, so that the latter are heated, inas much as they are located at the central part of the combustion chamber. Flame is diverted by said drums 23 to the right and left sides, and

Flame generated by combustion proceeds to a funnel 26 through the group of small heating tubes 18, the outer combustion chamber 24, the intervals between two adjacent headers, the upper combustion chamber 19 and the group of heating tubes 8.

When the feed valve is opened, feed water is supplied to one header 15 through the front halfportion of the feed collector 12 in water drum 10', and the group of water tubes 17 opened in said front half. portion of the feed collector, then it is introduced to fill up the back half portion of the feed collector 12 through the group of water tubes 17 opened in said back half portion of the feed regulator, and proceeds to the back half portion of the other water drum 10 through the connecting pipe 28. The feed water passes through the group of water tubes 17 opened in'said back half portion of the water drum 10 to the other header 15, the group of'water tubes opened in the front half part of the feed collector in water drum 410, and the front portion of the feed collector; thus, the feed water proceeds to the front steam and water drum 1 through the pipes after-it has filled the small heating tubes 18 and the headers 15 while a part of the feed water is introduced to the rear steam and water drum 6 through the circulating pipe 21 the inner pi e 23, the steam generatlng rum 20 and t e steam pipes 22. r

Having thus described my invention, what I claim is: w

A water tube boiler comprising a pair of steam and water drums 1, 6 each having a steam chamber 3, 3 and a water chamber 4,

4'; pipes 7, 8, 9 connecting the respective v chambers of said drums, a pair of water drums 10, 10 arranged at opposite sides of the boiler and below and approximately at right angles to the steam and water drums, pipes 27 each connecting one of the water drums to one of the steam and water drums,

headers 15' 'each connected to one ,of the steam and water drums and disconnected from e other such drum, tubes 18 connecting the .water drums to the headers and arranged i the combustion space of the boiler, sizleam g nerating drums 20 also arranged in t e s from the water drums into, extending longitudinally in and discharging'into the steam generating drums, and ipes 22 connecting said steam generating rums to the steam and water drums.

In testimony whereof I afiix my si KOTARO-E DO.

combustion space, pipes 21 leading ature. 

